Creating and initializing arrays

Declaring, creating, and initializing an array in JavaScript is straightforward, as shown in the following example:

let daysOfWeek = new Array(); // {1}
daysOfWeek = new Array(7); // {2}
daysOfWeek = new Array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'); // {3}
// preferred
daysOfWeek = []; // {4}
daysOfWeek = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']; // {5}

We can:

• Line {1}: declare and instantiate a new array using the keyword new – this will create an empty array.
• Line {2}: create an empty array specifying the length of the array (how many elements we are planning to store in the array).
• Line {3}: create and initialize the array, passing the elements directly in the constructor.
• Line {4}: create an empty array assigning empty brackets...